Search claims · PlantClaims

Associationobservedreview summarynegativemeasured

Claim · model-written summary

Mite damage was shown to decrease cassava root yield by up to 87%.

Taxon: cassavaManihot esculentat0
Interactor: arthropodsArthropodae1pest
Outcome: root and stake yielde1
Direction: decreasee1
Value: 87%e1
Qualifier: respectivelye1

Verbatim

t0
“The cassava mites”
✓ located verbatim in the source · title, characters 0–17

e1
“These arthropods cause three patterns of damage and have been shown to cause a decrease in root and stake yield of up to 87% and 82% respectively”
✓ located verbatim in the source · abstract, characters 188–333

Title

The cassava mites

D. H. Byrne; A. C. Bellotti; J. M. Guerrero Tropical Pest Management 1983. doi:10.1080/09670878309370833

Other claims from this paper (4)

Associationobservedreview summarynegativemeasured

Claim · model-written summary

Mite damage was shown to decrease cassava stake yield by up to 82%.

Taxon: cassavaManihot esculentat0
Interactor: arthropodsArthropodae1pest
Outcome: root and stake yielde1
Direction: decreasee1
Value: 82%e1
Qualifier: respectivelye1

Verbatim

t0
“The cassava mites”
✓ located verbatim in the source · title, characters 0–17

e1
“These arthropods cause three patterns of damage and have been shown to cause a decrease in root and stake yield of up to 87% and 82% respectively”
✓ located verbatim in the source · abstract, characters 188–333

Title

The cassava mites

D. H. Byrne; A. C. Bellotti; J. M. Guerrero Tropical Pest Management 1983. doi:10.1080/09670878309370833

Other claims from this paper (4)

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Dry root yield of cassava continued to decrease to 12.59 t/ha in December with June planting.

Taxon: cassavaManihot esculentat0
Treatment: in Decembere1
Outcome: Dry roots yieldse1
Direction: decreasee1
Value: 12.59 t ha-1e1
Setting: June plantinge1

Verbatim

t0
“cassava (Manihot esculenta Crantz)”
✓ located verbatim in the source · title, characters 70–104

e1
“Dry roots yields were highest (15.27 t ha-1) when roots were harvested in September, but continued to decrease up to 12.59 t ha-1 in December with June planting”
✓ located verbatim in the source · abstract, characters 857–1017

Title

Impact of water stress on fresh tuber yield and dry matter content of cassava (Manihot esculenta Crantz) in Côte d'Ivoire.

S. Bakayoko; A. Tschannen; Charlemagne Nindjin; et al. African Journal of Agricultural Research 2009. doi:10.5897/ajar.9000405

Other claims from this paper (10)

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Thinning reduced yield by about 11%.

Taxon: CassavaManihot esculentat0
Treatment: thinninge0
Outcome: yielde0
Direction: decreasee0
Value: about 11%e0

Not reportedComparator

Verbatim

e0
“reduction of canopy volume through thinning resulted in about 11% decrease in yield”
✓ located verbatim in the source · abstract, characters 1173–1256

t0
“Cassava Varieties”
✓ located verbatim in the source · title, characters 55–72

Title

Effect of Timely Break of Apical Dominance in Specific Cassava Varieties on Their Aboveground Biomass and Root Yield

Adrien Ndonda; Antoine Frangoie; Billy Bolakonga; et al. European journal of ecology, biology and agriculture. 2025. doi:10.59324/ejeba.2025.2(1).02

Other claims from this paper (4)

Intervention effect Cassava varieties responded differently to topping.
Association Topping effects depended on variety and capacity to produce new branches from dormant buds.
Intervention effect Nsansi had greater shoot emergence after terminal-bud removal.
Intervention effect Topping increased tuberous-root yield by nearly 39%.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Drought decreased cassava tuber yield.

Taxon: CassavaManihot esculentat0
Treatment: Drought stresse0
Outcome: tuber yielde0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“Drought stress caused a decrease in plant height, tuber yield; on the other hand, increased red spider mite attack.”
✓ located verbatim in the source · abstract, characters 677–792

t0
“Cassava”
✓ located verbatim in the source · title, characters 23–30

Title

Multiple Tolerances of Cassava Germplasm to Drought Stress and Red Spider Mite Attacks

Herdina Pratiwi; Tinuk Sri Wahyuni; Novita Nugrahaeni Biosaintifika Journal of Biology & Biology Education 2022. doi:10.15294/biosaintifika.v14i2.35781

Other claims from this paper (7)

Intervention effect Drought decreased cassava plant height.
Intervention effect Drought increased red spider mite attack on cassava.
Observation Eight cassava accessions had Stress Tolerance Index values above 1.00.
Observation Two cassava accessions with high stress tolerance index also resisted red spider mites.
Observation MLG 10361 showed high drought tolerance and red spider mite resistance.
Observation MLG 10362 showed high drought tolerance and red spider mite resistance.
Recommendation The authors propose MLG 10361 and MLG 10362 as sources of multiple resistance genes.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Additional defoliations decreased cassava root yield.

Taxon: cassavaManihot esculentae0
Treatment: additional onese0
Interactor: Z. variegatusZonocerus variegatuse0pest
Outcome: root yielde0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“A single defoliation of cassava (to simulate Z. variegatus feeding damage) does not decrease root yield, but additional ones do.”
✓ located verbatim in the source · abstract, characters 3181–3309

Title

Control of the variegated grasshopper Zonocerus variegatus (L.) on cassava

W. W. D. Modder TSpace 1994

Other claims from this paper (10)

Observation Early instars aggregate off farm, while later instars and adults move to crops when food becomes scarce.
Mechanism Aggregated feeding by larger grasshopper instars causes cassava leaves to wilt and lose HCN quickly.
Recommendation Eradication of Chromolaena odorata probably will not control the grasshopper.
Observation Chemical control is described as only short term effective and environmentally damaging.
Intervention effect Chemical sprays against the grasshopper kill parasitoids introduced for cassava mealybug control.
Intervention effect Exposing egg pods at the soil surface produced large grasshopper population reductions.
Intervention effect Fungal spores in kerosene and peanut oil killed 70-95% of field grasshopper populations.
Intervention effect A strain isolated from the grasshopper caused 90% mortality in 7-9 days in the laboratory.
Intervention effect Grasshoppers leaving spore baited traps died within 10 days, up to 30 m away.
Intervention effect One simulated defoliation did not decrease cassava root yield.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Fresh cassava root yield began declining with September planting.

Taxon: cassavaManihot esculentat0
Outcome: fresh storage root yielde1
Direction: decreasee0
Qualifier: Septembere0

Verbatim

e0
“began to decrease from September in both cultivars”
✓ located verbatim in the source · abstract, characters 472–522

e1
“The fresh storage root yield 12 months after planting”
✓ located verbatim in the source · abstract, characters 373–426

t0
“cassava”
✓ located verbatim in the source · title, characters 38–45

Title

The effect of planting dates on three cassava diseases in Cameroon

J. T. Ambe International Journal of Pest Management 1993. doi:10.1080/09670879309371811

Other claims from this paper (12)

Observation Fresh cassava root yield rose from March to August planting.
Observation The white-skinned cassava cultivar yielded more than the red-skinned cultivar by a mean 5–0 t/ha.
Observation The white-skinned cultivar had mean storage root number of 9.5 per 10 m2.
Association Cassava root yield followed rainfall pattern.
Association Cassava root yield showed an inverse relation to sunshine hours.
Observation Early cassava planting produced greater marketable yields.
Observation Cassava mosaic disease decreased from early to late plantings.
Observation Bacterial blight decreased from early to late cassava plantings.
Observation Leaf spot decreased from early to late cassava plantings.
Recommendation Cassava planting from March to October can yield profit in the study area.
Recommendation Early cassava planting is recommended for larger roots.
Recommendation Late cassava planting is recommended for disease-free quality leaves.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Yield decreased at a higher fertilizer N rate in Supanburi and Lopburi.

Taxon: cassavaManihot esculentat0
Treatment: 312 kg ha^(-1)e0
Outcome: Yielde0
Direction: decreasee0
Setting: Supanburi and Lopburie0

Verbatim

e0
“Yield appeared to decrease at the higher, 312 kg ha^(-1), at Supanburi and Lopburi”
✓ located verbatim in the source · abstract, characters 941–1023

t0
“cassava”
✓ located verbatim in the source · title, characters 25–32

Title

Nitrogen requirements of cassava in selected soils of Thailand

Kaweewong, Jakchaiwat; Kongkaew, Thanuchai; Tawornprek, Saowanuch; et al. Journal of Agriculture and Rural Development in the Tropics and Subtropics (University of Kassel) 2013

Other claims from this paper (10)

Observation Maximum fresh yield at Supanburi occurred at 187.5 kg N per hectare.
Observation Maximum fresh yield at Chonburi occurred at 187.5 kg N per hectare.
Observation Maximum fresh yield at Lopburi occurred at 250 kg N per hectare.
Observation Maximum fresh yield at Nakhon Ratchasima occurred at 250 kg N per hectare.
Observation Yield decreased at 250 kg per hectare in Chonburi.
Observation Net revenue at Lopburi was 70.4% higher than without N.
Observation Net revenue at Nakhon Ratchasima was 72.9% higher than without N.
Observation Net revenue at Supanburi was 53.8% higher than without N.
Observation Net revenue at Chonburi was 211.0% higher than without N.
Recommendation The authors recommend judicious higher N application to improve cassava production and revenue.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Yield decreased at 250 kg per hectare in Chonburi.

Taxon: cassavaManihot esculentat0
Treatment: 250 kg ha^(-1)e0
Outcome: Yielde0
Direction: decreasee0
Setting: Chonburie0

Verbatim

e0
“Yield appeared to decrease at the higher, 312 kg ha^(-1), at Supanburi and Lopburi, and 250 kg ha^(-1) (Chonburi) fertilizer N rates.”
✓ located verbatim in the source · abstract, characters 941–1074

t0
“cassava”
✓ located verbatim in the source · title, characters 25–32

Title

Nitrogen requirements of cassava in selected soils of Thailand

Kaweewong, Jakchaiwat; Kongkaew, Thanuchai; Tawornprek, Saowanuch; et al. Journal of Agriculture and Rural Development in the Tropics and Subtropics (University of Kassel) 2013

Other claims from this paper (10)

Observation Maximum fresh yield at Supanburi occurred at 187.5 kg N per hectare.
Observation Maximum fresh yield at Chonburi occurred at 187.5 kg N per hectare.
Observation Maximum fresh yield at Lopburi occurred at 250 kg N per hectare.
Observation Maximum fresh yield at Nakhon Ratchasima occurred at 250 kg N per hectare.
Observation Yield decreased at a higher fertilizer N rate in Supanburi and Lopburi.
Observation Net revenue at Lopburi was 70.4% higher than without N.
Observation Net revenue at Nakhon Ratchasima was 72.9% higher than without N.
Observation Net revenue at Supanburi was 53.8% higher than without N.
Observation Net revenue at Chonburi was 211.0% higher than without N.
Recommendation The authors recommend judicious higher N application to improve cassava production and revenue.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

A second reported low-moisture cassava root-yield comparison showed a 38.4% decrease, but the treatment is repeated ambiguously.

Taxon: CassavaManihot esculentat0
Treatment: SMC of 40-60%, FCe0
Outcome: Roots yielde0
Direction: decreasede0
Value: 38.4%e0
Comparator: SMC of 80-100% FCe0

Verbatim

e0
“Roots yield in the soil moisture content of 40-60% FC decreased by 76.2% and in the SMC of 40-60%, FC decreased by 38.4% compared to in the SMC of 80-100% FC.”
✓ located verbatim in the source · abstract, characters 1064–1222

t0
“Cassava”
✓ located verbatim in the source · title, characters 31–38

Title

The Agronomic Respons of Three Cassava Varieties at Various Level of Soil Moisture Content

Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor, Kampus IPB Dramaga, Bogor 16680; . Suwarto; Eko Sulistyono; et al. Jurnal Ilmu Pertanian Indonesia 2018. doi:10.18343/jipi.23.1.44

Other claims from this paper (11)

Association Soil moisture influenced cassava leaf number from six weeks after planting.
Association Soil moisture influenced cassava stem girth from eight weeks after planting.
Association Soil moisture influenced cassava plant height from ten weeks after planting.
Association Soil moisture influenced cassava lobus width from fourteen weeks after planting.
Association Soil moisture influenced cassava lobus length from fifteen weeks after planting.
Intervention effect At low soil moisture, cassava root dry weight was 64.4% of the high-moisture value.
Intervention effect At low soil moisture, cassava stem dry weight was 43.98% of the high-moisture value.
Intervention effect At low soil moisture, cassava leaf dry weight was 31.19% of the high-moisture value.
Intervention effect Cassava root yield at 40–60% field capacity decreased by 76.2% relative to 80–100%.
Observation Gajah had the highest water use efficiency among cassava varieties.
Observation Gajah had the highest root yield among cassava varieties.

“yield decrease”

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